Chamberlain Group says both sensor LEDs solid means the safety sensors are aligned and functioning normally. If the door still will not close, perform the safety-reversal test and then move to the opener’s closing/travel diagnostic path rather than continuing to adjust the photo eyes.
Read the two safety-sensor LEDs as a pair
Is the sender powered, and is the receiver seeing the beam?
Steady + steady = aligned baseline
On current Chamberlain Group safety-sensor guidance, amber identifies the sending sensor and green identifies the receiving sensor. Both LEDs steady is the normal aligned baseline; an off or blinking green receiver moves diagnosis toward alignment, obstruction or receiving-side wiring depending on the exact state.
What you are likely to notice
- Amber sending LED is solid
- Green receiving LED is solid
- The door still stops, reverses, hums, clicks or refuses to complete closing
Check these in order
1. Confirm both LEDs stay solid during the attempt
Watch the sensor pair while the door starts moving. A wire or bracket can be intermittent even if the LEDs look normal while the door is stationary.
2. Test the safety reversal system
Use the manufacturer test to confirm the door responds correctly when the beam is interrupted. Solid LEDs plus a passing reversal test are stronger evidence that the photo-eye branch is healthy.
3. Record the opener behavior
Note whether the motor hums, the door travels less than several inches, the door reaches the floor then reverses, or a code/arrow pattern appears. Chamberlain organizes closing help around these different symptoms.
4. Follow travel/force diagnosis only for the exact symptom
If the sensors remain normal, use the model’s travel and obstruction guidance. Do not increase force just because the door will not close; mechanical binding must be ruled out first.
Normal sensor LEDs let you stop looping on the same fix
When both LEDs are solid, Chamberlain considers the sensors aligned. If the safety test also passes, the troubleshooting value shifts to the opener's actual motion, sound and diagnostic codes. That is a better use of the next five minutes than realigning an already stable beam.
A closing failure can still involve obstruction, travel, force, a wall-control issue, internal electronics or the door itself. Choose the next diagnostic step from what the opener actually does, not from the assumption that every no-close symptom is a sensor problem.
Describe distance traveled before reversal
Chamberlain's closing help separates symptoms such as a door that moves only a few inches from one that travels farther or reaches the floor before reversing. Record that distance and any beep/flash pattern because it determines which model-specific branch is relevant.
If the door binds manually, stop before force or travel adjustments. The opener should not be used to overpower a mechanical door problem.
Both sensor LEDs solid means stop re-aiming and move downstream
Chamberlain's alignment guidance treats both safety-sensor LEDs solid as the normal aligned state. If the door still will not close while both lights remain solid, repeating the same alignment adjustment has diminishing diagnostic value. Preserve the solid-LED observation and look for a separate closing issue such as travel behavior, door binding or a manufacturer diagnostic code.
The next useful split is the door's movement: does it never start down, stop before the floor, touch the floor and reopen, or show an UP/DOWN code at the same time? A verified code should outrank a generic symptom list. If the door itself is heavy, off-track or abnormal by hand, stop before adjusting opener force; that points to a door-system problem rather than a sensor-aim problem.
- Both LEDs solid: preserve that result and stop endless sensor alignment.
- Use movement/reversal point and any diagnostic code to choose the next branch.
- Do not increase force to compensate for a heavy, binding or damaged door.
For a solid-LED case, record that both sensor lights stayed solid throughout the failed close, the exact point where motion stopped or reversed, and any opener diagnostic code. This evidence lets the next branch move beyond sensor alignment toward travel, RPM, door-condition or model-specific closing logic without replacing a sensor pair that was reporting normal alignment.
Stop DIY troubleshooting when…
- The safety reversal test fails
- The door is heavy, binding or off-track
- The opener reports an internal fault
- Troubleshooting would require high-force door hardware work
Garage door springs, cables and a falling/unbalanced door can store or release dangerous force. Those are door-system problems, not just opener settings.
Common questions
If both Chamberlain sensor lights are solid, are the sensors okay?
Chamberlain says both solid indicates the sensors are aligned and functioning normally at that point; confirm with the safety-reversal test.
Why does the door still not close?
The remaining cause may be elsewhere: travel/force, obstruction, controls, opener electronics or the mechanical door. Use the exact motion/code symptom next.
Should I increase closing force?
Not before confirming the door is mechanically healthy and following the exact opener's diagnostic procedure.
Manufacturer sources used
These links are the factual baseline for the diagnostic claims above. Model-specific manuals can supersede general guidance.